DESCRIPTION
The IDT821054 is a feature rich, single-chip, programmable 4-channel PCM CODEC with on-chip filters. Besides the µ-Law/A-Law companding and linear coding/decoding (14 effective bits + 2 extra sign bits), the IDT821054 also provides 1 FSK generator for sending Caller-ID messages, 2 programmable tone generators per channel (which can generate ring signals) and 2 programmable chopper clocks for SLICs.

FEATURES
• 4-channel CODEC with on-chip digital filters
• Software selectable A/µ-law, linear code conversion
• Meets ITU-T G.711 - G.714 requirements
• Programmable digital filters adaptingto system demands:
   - AC impedance matching
   - Transhybrid balance
   - Frequency response correction
   - Gain setting
• Supports two programmable PCM buses
• Flexible PCM interface with up to 128 programmable time slots, data rate from 512 kbits/s to 8.192 Mbits/s
• MPI control interface
• Broadcast mode for coefficient setting
• 7 SLIC signaling pins (including 2 debounced pins) per channel
• Fast hardware ring trip mechanism
• 2 programmable tone generators per channel for testing, ringing and DTMF generation
• 1 programmable FSK generator for sending Caller-ID messages
• Two programmable chopper clocks
• Master clock frequency selectable: 1.536 MHz, 1.544 MHz, 2.048 MHz, 3.072 MHz, 3.088 MHz, 4.096 MHz, 6.144 MHz, 6.176 MHz or 8.192 MHz
• Advanced test capabilities:
   - 3 analog loopback tests
   - 5 digital loopback tests
   - Level metering function
• High analog driving capability (300 Ω AC)
• TTL/CMOS compatible digital I/O
• CODEC identification
• +5 V single power supply
• Low power consumption
• Operating temperature range: -40°C to +85°C
• Package available: 64 Pin PQFP